JP7446166B2 - liquid fertilizer supply system - Google Patents

Description

The present invention relates to a system for mixing and supplying water and liquid fertilizer.

Conventionally, there is an apparatus that mixes a plurality of liquid fertilizers with water, adjusts the fertilizer components contained in each liquid fertilizer to a predetermined ratio to form a diluted liquid fertilizer, and supplies this diluted liquid fertilizer to plants (see Patent Document 1). In the device described in Patent Document 1, each liquid fertilizer is supplied from each liquid fertilizer tank to a discharge line to which water is supplied, and diluted liquid fertilizer with adjusted fertilizer components is supplied to plants from the discharge line.

Patent No. 4167591

By the way, in the device described in Patent Document 1, each liquid fertilizer supplied from each liquid fertilizer tank is supplied to plants through a common discharge line (flow path). For this reason, multiple types of liquid fertilizers will be mixed in the discharge line. There are various types of liquid fertilizers, such as organic liquid fertilizers, inorganic liquid fertilizers, acidic liquid fertilizers and alkaline liquid fertilizers, and they have compatibility. For this reason, when multiple types of liquid fertilizers are mixed, there is a risk that the components of each liquid fertilizer may change or that solid components may precipitate.

In addition, even when a plurality of types of liquid fertilizers are sequentially supplied, this situation is generally the same in a configuration in which the plurality of types of liquid fertilizers flow through a common flow path.

The present invention has been made to solve the above problems, and its main purpose is to provide a liquid fertilizer supply system that supplies multiple types of liquid fertilizer even when multiple types of liquid fertilizer flow through a common flow path. The objective is to suppress changes in the components of each liquid fertilizer and precipitation of solid components.

The first means for solving the above problem is a liquid fertilizer supply system, which
a first flow path connected to a supply port for supplying water and liquid fertilizer to the field;
a first valve that opens and closes the first flow path;
a pump that pumps up liquid fertilizer from each of the plurality of tanks and discharges it to the first flow path;
a control unit that controls the pump;
A second branch branching from between the first valve and a position where the liquid fertilizer discharged by the pump flows in the first flow path, and connected to a discharge port that discharges the water and the liquid fertilizer to a place other than the field. A flow path and
a second valve that opens and closes the second flow path;
Equipped with
The control unit pumps up a first liquid fertilizer of the liquid fertilizer from a first tank of the plurality of tanks and discharges it into the first flow path, and then pumps up the liquid fertilizer from a second tank different from the first tank. Among them, a cleaning operation is performed in which only the water is flowed into the first flow path and the second flow path between pumping up a second liquid fertilizer different from the first liquid fertilizer and discharging it into the first flow path. The pump is controlled to.

According to the above configuration, the first flow path is connected to the supply port that supplies water and liquid fertilizer to the field. The first valve opens and closes the first flow path. The pump pumps up liquid fertilizer from each of the plurality of tanks and discharges it into the first channel. Therefore, by driving the pump with the first flow path open by the first valve, water and liquid fertilizer (liquid fertilizer) are mixed in the first flow path to form a mixed liquid, and the mixed liquid is passed from the supply port. Supplied to the field.

The second flow path branches from between the first valve and a position where the liquid fertilizer discharged by the pump flows in the first flow path, and is connected to a discharge port that discharges water and liquid fertilizer outside the field. The second valve opens and closes the second flow path. Therefore, by closing the first flow path using the first valve and opening the second flow path using the second valve, water and liquid fertilizer can be discharged from the discharge port outside the field without being supplied to the field. Can be done.

Here, the control unit pumps up a first liquid fertilizer of the liquid fertilizer from a first tank of the plurality of tanks and discharges it into the first channel, and then pumps up a first liquid fertilizer of the liquid fertilizer from a second tank different from the first tank. The pump is controlled to perform a cleaning operation of flowing only water into the first flow path and the second flow path between pumping up the second liquid fertilizer different from the first liquid fertilizer and discharging it into the first flow path. Therefore, when the first liquid fertilizer is poured into the first channel, the cleaning operation is performed before the second liquid fertilizer, which is different from the first liquid fertilizer, is poured into the first channel. 1 Liquid fertilizer can be washed away with water. Therefore, it is possible to prevent the first liquid fertilizer and the second liquid fertilizer from mixing in the first flow path, and it is possible to prevent the components of the first liquid fertilizer and the second liquid fertilizer from changing and solid components from precipitating. Can be suppressed.

Furthermore, during the cleaning operation, by closing the first flow path with the first valve and opening the second flow path with the second valve, the water used in the cleaning operation is not supplied to the field and is removed from the discharge port. can be discharged outside the field. Therefore, it is possible to prevent the water used for the cleaning operation from being unintentionally supplied to the field. Note that the first valve and the second valve may be manual valves that are manually opened and closed by an operator, or may be electromagnetic valves that are opened and closed under control of a control unit.

If the liquid fertilizer supply system is not used for a long period of time after the first liquid fertilizer is pumped up from the first tank and discharged into the first flow path, the water in the mixed liquid in the first flow path may evaporate and the first liquid fertilizer Components may precipitate. In this case, even if a cleaning operation is performed before pumping up the second liquid fertilizer from the second tank and discharging it into the first channel, there is a possibility that the precipitated components of the first liquid fertilizer cannot be washed away with water.

In this regard, in the second means, the control unit controls the pump to perform the cleaning operation immediately after pumping up the first liquid fertilizer from the first tank and discharging it into the first flow path. do. According to such a configuration, the first liquid fertilizer in the first channel can be quickly washed away with water before the components of the first liquid fertilizer precipitate.

In a third means, the first valve and the second valve are electromagnetic valves that are opened and closed under control of the control unit, and the control unit causes the first valve to open the first flow path and With the second flow path closed by the second valve, the first liquid fertilizer is pumped up from the first tank and discharged into the first flow path, and then the first liquid fertilizer is closed by the first valve. The first valve is opened and the second flow path is closed by the second valve, and the second liquid fertilizer is pumped up from the second tank and discharged into the first flow path. The pump is controlled to perform the cleaning operation while the first flow path is closed and the second flow path is opened by the second valve.

According to the above configuration, the first valve and the second valve are electromagnetic valves, and are opened and closed under control of the control unit. Therefore, the first valve and the second valve can be opened and closed by the control of the control unit without the operator having to manually open and close the first valve and the second valve.

Then, the control unit pumps up the first liquid fertilizer from the first tank and discharges it into the first flow path with the first valve opening the first flow path and the second valve closing the second flow path. After that, the first flow path is opened by the first valve and the second flow path is closed by the second valve, and the second liquid fertilizer is pumped up from the second tank and discharged into the first flow path. Then, the pump is controlled to perform the cleaning operation with the first valve closing the first flow path and the second valve opening the second flow path. Therefore, the control unit collectively controls the supply of the first liquid fertilizer to the field, the cleaning operation of the first channel, and the supply of the second liquid fertilizer to the field through control of the first valve and the second valve. be able to.

The fourth means includes a flow rate sensor that detects the flow rate of the water flowing through the first flow path, and a terminal wirelessly connected to a server, and the control unit is wirelessly connected to the server. , the terminal is configured to allow an operator to set the volume of the water in the mixed liquid and the volume of the liquid fertilizer, transmits the set volume of the water and the volume of the liquid fertilizer to the server, and controls the control. The unit receives the volume of the water and the volume of the liquid fertilizer from the server, and the unit receives the volume of the water and the volume of the liquid fertilizer based on the flow rate of the water detected by the flow rate sensor and the received volume of the water and the volume of the liquid fertilizer. The pump is controlled so that a liquid mixture mixed in a ratio of the volume of the water to the volume of the liquid fertilizer is supplied to the supply port.

According to the above configuration, the flow rate sensor detects the flow rate of water flowing through the flow path. The control unit and the terminal are wirelessly connected to the server. Note that the configuration in which the control unit and the server are wirelessly connected includes a configuration in which the control unit and the server are wirelessly connected via an access point (relay point). The configuration in which the terminal and the server are wirelessly connected includes the configuration in which the terminal and the server are wirelessly connected via an access point.

Here, the terminal is configured to allow the operator to set the volume of water and liquid fertilizer in the liquid mixture, and transmits the set volume of water and volume of liquid fertilizer to the server. Then, the control unit receives the volume of water and the volume of liquid fertilizer from the server. Therefore, the operator can set the volume of water in the liquid mixture and the volume of liquid fertilizer using the terminal at hand without having to go to the field where the flow path and pump are installed. Therefore, when setting (changing) the mixing ratio of water and liquid fertilizer, it is possible to save the worker the trouble of going to the field.

Further, the control unit is configured to control the control unit to generate a liquid mixture mixed at a ratio of the volume of the received water and the volume of the liquid fertilizer based on the flow rate of water detected by the flow rate sensor, the volume of the received water, and the volume of the liquid fertilizer. Control the pump to supply from the supply port. Therefore, even if each agricultural instructor or liquid fertilizer manufacturer has a different idea of the mixing ratio, the operator can simply set the volume of water and liquid fertilizer in the desired mixture, and the water and liquid fertilizer can be adjusted to the desired level. The mixed liquid mixed at the mixing ratio can be supplied from the supply port. Therefore, the operator does not need to modify and set the mixing ratio according to differences in the concept of mixing ratio, and can easily adjust the mixing ratio of water and liquid fertilizer in the mixed solution supplied to the field to the desired mixing ratio. Can be set to .

In the fifth means, when controlling the pump so that a mixed liquid mixed at a ratio of the volume of the received water to the volume of the liquid fertilizer is supplied from the supply port, The pump is controlled so that the flow rate of the liquid fertilizer is proportional to the flow rate of the water detected by the flow rate sensor.

According to the above configuration, even if the water flow rate changes during the supply of the mixed liquid, by making the liquid fertilizer flow rate proportional to the water flow rate detected by the flow rate sensor, the volume of the received water and the volume of the liquid fertilizer can be adjusted. A mixed liquid mixed at a ratio of 1 to 1 can be supplied from the supply port.

In the sixth means, the terminal allows an operator to set a water flow period for flowing the water through the first channel and a water flow amount for flowing the water when supplying the mixed liquid from the supply port. The controller is configured to transmit the set water flow period and the water flow rate to the server, receive the water flow period and the water flow rate from the server, and send the mixed liquid to the water flow rate. The time when the period during which the water was passed through the first flow path when supplying from the supply port becomes the water passage period, and the volume of the water that passed when supplying the mixed liquid from the supply port. The flow of water in the first channel is stopped and the pump is stopped at the earlier time point when the total reaches the received water flow amount.

According to the above configuration, the terminal is configured such that the operator can set the water flow period during which water is passed through the first channel and the water flow rate during which water is passed through the first channel when the mixed liquid is supplied from the supply port. , sends the set water flow period and water flow amount to the server. Then, the control unit receives the water flow period and water flow amount from the server. Therefore, without having to go to the field where the first flow path and pump are installed, the operator can use a terminal at hand to pass water through the first flow path when supplying the mixed liquid from the supply port. The period and water flow rate can be set. Therefore, when setting (changing) the period and amount of supply of the mixed liquid from the supply port, it is possible to save the operator the trouble of going to the field.

Furthermore, the control unit controls when the period during which water is passed through the first channel when supplying the mixed liquid from the supply port becomes a water passage period, and when the water passed when supplying the mixed liquid from the supply port. The flow of water in the first channel is stopped and the pump is stopped at the earlier point in time when the total volume of the amount of water reaches the received amount of water flow. Therefore, even if one of the detection of the water flow rate by the flow rate sensor and the setting of the water flow period is inappropriate, the flow of water in the first flow path is stopped preferentially based on the other appropriate one. The pump can be stopped.

When the liquid fertilizer in the tank runs out or when the pump is stopped for a long period of time, air may get mixed into the piping from the tank to the first flow path. In this case, in order to accurately adjust the mixing ratio of water and liquid fertilizer to a desired mixing ratio, it is necessary to remove air from the piping.

In this regard, in the seventh means, the terminal is configured such that the operator can set execution or non-execution of a filling operation of filling the pipe from the tank to the first flow path with the liquid fertilizer and removing air. and transmits the set execution or non-execution of the filling operation to the server, and the control unit receives the execution or non-execution of the filling operation from the server, and receives the execution of the filling operation. controlling the pump to perform the filling operation.

Therefore, by setting execution of the filling operation by the operator, the piping from the tank to the first channel can be filled with liquid fertilizer and air can be removed. Therefore, the mixing ratio of water and liquid fertilizer can be accurately adjusted to a desired mixing ratio.

The eighth means includes a terminal wirelessly connected to a server, wherein the control unit is wirelessly connected to the server, and the terminal fills a pipe from the tank to the first flow path with the liquid fertilizer. The operator is configured to be able to set execution or non-execution of a filling operation that removes air, and transmits the set execution or non-execution of the filling operation to the server, and the control unit When execution or non-execution of an operation is received from the server, and execution of the filling operation is received, the first valve closes the first flow path and the second valve opens the second flow path. The pump is controlled to perform the filling operation while the pump is in a closed state.

According to the above configuration, the filling operation can be performed with the first valve closing the first flow path and the second valve opening the second flow path. Therefore, it is possible to avoid supplying liquid fertilizer whose mixing ratio is not adjusted to the field.

Block diagram of liquid fertilizer supply system. A diagram showing the main screen of the liquid fertilizer application. The figure which shows the operation setting screen of a liquid fertilizer application. The figure which shows the main screen of the liquid fertilizer application when the remaining amount of liquid fertilizer is low. The figure which shows the liquid fertilizer filling screen of a liquid fertilizer application. A diagram showing the main screen of the liquid fertilizer application when an abnormality occurs.

Hereinafter, one embodiment of a liquid fertilizer supply system that supplies a mixture of water and liquid fertilizer to a field will be described with reference to the drawings. As shown in FIG. 1, the liquid fertilizer supply system 10 includes a main flow path 11, liquid fertilizer pumps 13, 14, manual valves 15, 17A to 17C, 18, a control unit 30, a flow rate sensor 51, a mobile terminal 60, and the like.

The upstream end of the main flow path 11 (first flow path) is connected to a water source 20 . The water source 20 is a water supply channel or a well water supply path pressurized by a pump, and supplies water at a predetermined pressure. The main flow path 11 is provided with a manual valve 15, a filter 16, a flow rate sensor 51, a check valve 19, a pressure sensor 33, a solenoid valve 34, and manual valves 17A to 17C in this order from the upstream side.

The manual valve 15 is a manual valve that opens and closes the main flow path 11. The filter 16 is a filter that removes foreign matter contained in the water flowing through the main flow path 11. The flow rate sensor 51 detects the flow rate of water flowing through the main channel 11 and outputs the detection result to the control board 31. The check valve 19 allows water to flow from the flow sensor 51 to the electromagnetic valve 34 and prohibits water from flowing from the electromagnetic valve 34 to the flow sensor 51.

A pressure sensor 33 and a solenoid valve 34 are included in the control unit 30. The pressure sensor 33 detects the pressure of water flowing through the main channel 11 and outputs the detection result to the control board 31. The solenoid valve 34 is an electromagnetic valve that opens and closes the main flow path 11 . The solenoid valve 34 is a normally closed solenoid valve, and is controlled by the control board 31. The downstream portion of the main flow path 11 branches into main flow paths 11A to 11C. The manual valves 17A to 17C (first valves) are manual valves that open and close the main channels 11A to 11C, respectively. Main channels 11A to 11C (first channels) are connected to supply ports 29A to 29C, respectively. Supply piping is connected to the supply ports 29A to 29C. Then, a mixed solution of water and liquid fertilizer (hereinafter also simply referred to as "mixed solution") is supplied to the field through the supply pipe. Each supply pipe may extend to different locations in the same field, or may extend to different fields.

Pipes 21 and 22 (tubes) are connected to a portion of the main flow path 11 between the check valve 19 and the pressure sensor 33 (hereinafter referred to as the "mixing section 11a"). Ends of the pipes 21 and 22 opposite to the main flow path 11 are connected to discharge ports of liquid fertilizer pumps 13 and 14, respectively. Pipes 23 and 24 (tubes) are connected to the suction ports of the liquid fertilizer pumps 13 and 14, respectively. Ends of the pipes 23 and 24 opposite to the liquid fertilizer pumps 13 and 14 are inserted into tanks 25 and 26, respectively. Liquid fertilizer A and liquid fertilizer B (liquid fertilizer) are stored in the tanks 25 and 26, respectively. The liquid fertilizer pumps 13 and 14 are electric pumps driven by motors, and pump up liquid fertilizer A and liquid fertilizer B from tanks 25 and 26, respectively, and discharge them into the main flow path 11. The liquid fertilizer pumps 13 and 14 are controlled by a control board 31. Further, the liquid fertilizer pumps 13 and 14 output the rotational speed of the motor and the presence or absence of an abnormality to the control board 31.

Liquid fertilizer A (first liquid fertilizer) and liquid fertilizer B (second liquid fertilizer) are different types of liquid fertilizers, and are mixed with water at a predetermined ratio and sprayed on a field. The ratio between water and liquid fertilizer A, the ratio between water and liquid fertilizer B, and the ratio between water and liquid fertilizer A and liquid fertilizer B are specified for each agricultural instructor or for each liquid fertilizer manufacturer. In addition, the mixing part 11a functions as a mixer that mixes water and liquid fertilizer.

A pipe 27 is connected to a portion of the main flow path 11 between the solenoid valve 34 and the manual valves 17A to 17C. A manual valve 18 (second valve) that opens and closes the pipe 27 is provided in the pipe 27 (second flow path). An end of the piping 27 on the opposite side to the main flow path 11 is connected to a sampling port 28 . Piping is connected to the sampling port 28 (discharge port). Then, a sample of the mixed solution of water and liquid fertilizer is collected from the pipe, and the mixed solution that has not been adjusted in the liquid fertilizer filling operation and cleaning operation described later is discharged to a place other than the field.

The control unit 30 includes a control board 31, a communication device 32, the pressure sensor 33, and the electromagnetic valve 34. The control board 31 (control unit) includes a CPU, ROM, RAM, input/output interface, and the like. A communication device 32 is mounted on the control board 31. The communication device 32 includes a receiving antenna, a transmitting antenna, an input circuit, an output circuit, and the like. The control board 31 performs wireless communication with the cloud 90 via the communication device 32. That is, the control board 31 (control unit 30) is wirelessly connected to the cloud 90.

The cloud 90 (server) is composed of servers and the like, and provides predetermined services according to each liquid fertilizer supply system 10 (each worker). Cloud 90 performs wireless communication with mobile terminal 60. That is, the cloud 90 is wirelessly connected to the mobile terminal 60. Cloud 90 receives information from mobile terminal 60 and transmits the received information to control unit 30 . The cloud 90 also receives information from the control unit 30 and transmits the received information to the mobile terminal 60.

The mobile terminal 60 (terminal) is a smartphone, a tablet terminal, a notebook computer, a dedicated wireless terminal, or the like. The mobile terminal 60 functions as an operating device that remotely controls the control unit 30 by installing a predetermined application (software). In this embodiment, a liquid fertilizer mixing application (hereinafter referred to as "liquid fertilizer application") is installed on the mobile terminal 60, and by operating the liquid fertilizer application, the operator remotely controls the control unit 30 and, by extension, the liquid fertilizer pumps 13 and 14. do.

When supplying the mixed liquid to the field, the operator opens the manual valve 15 and at least one of the manual valves 17A to 17C in advance, and closes the manual valve 18 in advance. Then, the control board 31 opens the solenoid valve 34 and drives the liquid fertilizer pumps 13 and 14, thereby starting to supply the mixed liquid to at least one of the supply ports 29A to 29C. Thereafter, the control board 31 closes the electromagnetic valve 34 and stops the liquid fertilizer pumps 13 and 14, thereby ending the supply of the mixed liquid.

FIG. 2 is a diagram showing the main screen of the liquid fertilizer application. The main screen of the liquid fertilizer app includes the following items. The worker checks the displayed content of each item and operates the icon and slide switch of each item.

“Status” indicates the state of the liquid fertilizer supply system 10. "Elapsed time" indicates the time elapsed since the start of supplying the mixed solution of water and liquid fertilizer. The "integrated flow rate" indicates the integrated value of the flow rate of water (total amount of water flowing) after the start of supplying the mixed liquid.

The "driving settings" icon is an icon for transitioning to a driving setting screen, which will be described later. The "liquid fertilizer filling" icon is an icon for transitioning to a liquid fertilizer filling screen, which will be described later. The "alert reset" icon is an icon for resetting an alert (warning text).

"Alert" indicates that an alert is currently occurring or that no alert is occurring. The "liquid fertilizer remaining amount notification" indicates whether the remaining amounts of liquid fertilizer A and liquid fertilizer B in the tanks 25 and 26 are small. ``Start operation with set contents'' uses a slide switch to switch between starting operation with the contents set on the operation setting screen, which will be described later, or forcing a stop. "Pause" is a slide switch that allows you to temporarily stop or resume operation.

FIG. 3 is a diagram showing the operation setting screen of the liquid fertilizer application. When the operator operates the "operation settings" icon in FIG. 2, the screen shifts to the operation settings screen. The operation setting screen of the liquid fertilizer app includes the following items. The worker sets the contents of each item and operates the slide switch of each item.

In the "operation settings" area, "water flow time" (water flow period) is the time (period) during which the solenoid valve 34 in FIG. is the time from the start of supply of the mixed liquid to the end of supply. The "amount of water flow" is the total amount of water flowing in one supply operation of the mixed liquid, and is the amount of water used from the start of supply of the mixed liquid to the end of supply.

"Cleaning operation" is a slider that selects whether or not to conduct water flow to the main flow path 11, that is, to perform a cleaning operation of the main flow path 11 immediately after (after supply) a mixed solution of liquid fertilizer A or liquid fertilizer B and water. Switch with a switch. The "amount of water flowing during cleaning" is the total amount of water flowing during the cleaning operation, and sets the amount of water used from the start to the end of cleaning. When the slide switch for "cleaning operation" is switched to "necessary", the liquid fertilizer supply system 10 operates "during cleaning" without discharging liquid fertilizer A and liquid fertilizer B to the main flow path 11 immediately after supplying the mixed liquid. The amount of water set in "Water Flow Rate" is caused to flow into the main flow path 11 and the piping 27. At this time, the operator closes the manual valves 17A to 17C and opens the manual valve 18, and the control board 31 stops the liquid fertilizer pumps 13 and 14 and opens the solenoid valve .

That is, the control board 31 pumps up liquid fertilizer A (first liquid fertilizer) from tank 25 (first tank) of tanks 25 and 26 (a plurality of tanks) and discharges it to mixing section 11a (first flow path). The main flow path 11 (first flow path) and The liquid fertilizer pumps 13 and 14 are controlled to perform a cleaning operation in which only water flows into the pipe 27 (second flow path). In addition, it is also possible to use the tank 26 as the first tank, the liquid fertilizer B as the first liquid fertilizer, the tank 25 as the second tank, and the liquid fertilizer A as the second liquid fertilizer.

In the area of "Mixing ratio setting", "Water [for L]" sets the volume of water when mixing water and liquid fertilizer A or liquid fertilizer B. Here, the volume of water is set to 100L. "Liquid Fertilizers 1 to 6" allows you to switch whether or not to use liquid fertilizers A to F (liquid fertilizers 1 to 6) with a slide switch, and also to adjust the volume of liquid fertilizers A to F when mixing water and liquid fertilizers A to F. Set. As shown in FIG. 1, liquid fertilizer pumps 13 and 14 that pump liquid fertilizers 1 and 2 (liquid fertilizers A and B) are connected to a control board 31, and liquid fertilizer pumps that pump liquid fertilizers 3 to 6 (liquid fertilizers C to F) are controlled. It is not connected to the board 31. For this reason, only liquid fertilizers 1 and 2 can be switched between being used or unused, and liquid fertilizers 3 to 6 cannot be switched between being used or unused (the slide switch is displayed as a broken line or in a faint state). Here, the volumes of liquid fertilizers 1 and 2 are each set to 1 L. Further, the volumes of liquid fertilizers 3 to 6 are each set to 0L.

By the way, when mixing water and liquid fertilizer, the concept of the mixing ratio may differ depending on each agricultural instructor or each chemical manufacturer. For example, in the case of "setting the mixing ratio to 1/100", there are two ways of thinking: water:liquid fertilizer A=100:1, and water:liquid fertilizer A=99:1.

In this regard, if the concept of water:liquid fertilizer A=100:1 is adopted, the operator should enter 100 in "water [ ] for L" and 1 in "liquid fertilizer 1". good. Also, if the idea is to use water:liquid fertilizer A=99:1, the operator should enter 99 in "water [ ] for L" and 1 in "liquid fertilizer 1". . That is, the operator does not need to consider the definition of the mixing ratio, and can simply input the ratio between the volume of water and the volume of liquid fertilizer.

The mobile terminal 60 then displays the above "water flow time", the above "water flow amount", the above "washing operation", the above "water flow amount during cleaning", "water [for ]L", "liquid fertilizer 1", and the contents set in “liquid fertilizer 2” (hereinafter referred to as “setting contents”) are transmitted to the cloud 90. That is, the mobile terminal 60 is configured to allow the operator to set the volume of water and the volume of liquid fertilizers A and B in the mixed solution of water and liquid fertilizers A and B, and the set volume of water and liquid fertilizers A and B are set by the operator. Send the volume of B to the cloud 90. Furthermore, the mobile terminal 60 is configured to allow the operator to set the water flow time (water flow period) during which water flows through the main channel 11 when supplying the mixed liquid from the supply ports 29A to 29C. The determined water flow period is transmitted to the cloud 90.

The control board 31 receives the setting contents from the cloud 90 via the communication device 32. That is, the control board 31 receives the setting contents from the mobile terminal 60 via the cloud 90 and the communication device 32.

The control board 31 calculates the discharge amount S1 [L/min] of the liquid fertilizer 1 (liquid fertilizer A) and controls the liquid fertilizer pump 13 according to the following procedure. Note that the manual valves 15, 17A are opened in advance, and the manual valves 17B, 17C, 18 are closed in advance. Then, the control board 31 opens the solenoid valve 34.

First, the flow rate Fw [L/min] of water detected by the flow rate sensor 51 is acquired. The supply time t [min] is calculated by dividing the received water volume Vw [L] by the water flow rate Fw [L/min] (t=Vw/Fw).

Next, the volume V1 [L] of the received liquid fertilizer 1 (liquid fertilizer A) is divided by the supply time t [min] to calculate the discharge amount S1 [L/min] of the liquid fertilizer 1 (S1=V1/t). .

Subsequently, the water pressure Pw [Pa] detected by the pressure sensor 33 is acquired. Based on the water pressure Pw [Pa], the rotational speed of the motor of the liquid fertilizer pump 13 is controlled so that the discharge amount of the liquid fertilizer 1 becomes the discharge amount S1 [L/min]. Note that the relationship between the water pressure Pw [Pa], the discharge amount S1 [L/min] of the liquid fertilizer 1, and the rotational speed of the motor of the liquid fertilizer pump 13 is obtained in advance based on experiments and the like. Those relationships are defined as maps and calculation formulas.

That is, based on the flow rate of water detected by the flow rate sensor 51, the volume of the received water, and the volume of the liquid fertilizer, a mixed liquid mixed in the ratio of the volume of the received water to the volume of the liquid fertilizer is supplied to the supply port 29A. The liquid fertilizer pump 13 is controlled so that the liquid fertilizer is supplied from the liquid fertilizer pump 13. Further, at this time, the liquid fertilizer pump 13 is controlled so that the flow rate of the liquid fertilizer 1 is proportional to the flow rate of water detected by the flow rate sensor 51.

The above steps are repeated at a predetermined period (for example, 1 [sec]), and the cumulative flow rate Tw [L] is calculated by integrating the water flow rate Fw [L/min] at each predetermined period. Then, when the cumulative flow rate Tw reaches the received water flow rate, the solenoid valve 34 is closed and the liquid fertilizer pump 13 is stopped.

Also, when the elapsed time after opening the solenoid valve 34 reaches the received water flow time, the solenoid valve 34 is closed and the liquid fertilizer pump 13 is stopped.

That is, the control board 31 receives the water flow time from the cloud 90, and determines the water flow time (water flow time) by determining the time (period) during which water is passed through the main channel 11 when supplying the mixed liquid from the supply ports 29A to 29C. The amount of water in the main flow path 11 is reached at the earlier of the time when the total volume of water flowing when supplying the mixed liquid from the supply port 29A reaches the received water flow rate. The flow is stopped and the liquid fertilizer pump 13 is stopped. In addition, when supplying the liquid fertilizer 2 (liquid fertilizer B) from the supply port 29B, the control board 31 is connected to the liquid fertilizer pump 14 with the manual valves 15 and 17B opened in advance and the manual valves 17A, 17C, and 18 closed in advance. Executes the same control as above.

FIG. 4 is a diagram showing the main screen of the liquid fertilizer application when the remaining amounts of liquid fertilizers A and B become low. Here, the "notification of low remaining amount of liquid fertilizer" indicates that the remaining amount of liquid fertilizer A (liquid fertilizer 1) in the tank 25 is small, and urges replenishment of liquid fertilizer A.

When the operator confirms the above-mentioned contents of the "notification of low liquid fertilizer remaining amount" on the mobile terminal 60, the operator replenishes the tank 25 with liquid fertilizer A in the field. At this time, air may get mixed into the pipes 21 and 23 from the tank 25 to the main flow path 11. In this case, in order to accurately adjust the mixing ratio of water and liquid fertilizer A to a desired mixing ratio, it is necessary to remove air from the pipes 21 and 23.

Therefore, the main screen of the liquid fertilizer app includes an icon for "liquid fertilizer filling." When the operator operates the "liquid fertilizer filling" icon, the screen shifts to the liquid fertilizer filling screen shown in FIG. 5. The liquid fertilizer filling screen of the liquid fertilizer app includes the following items. After closing the manual valves 17A to 17C and opening the manual valve 18, the operator operates the slide switches for each item.

For "Liquid Fertilizers 1 to 6", whether or not to perform the liquid fertilizer filling operation for each of Liquid Fertilizers 1 to 6 is switched by a respective slide switch. As described above, the liquid fertilizer pumps 13 and 14 that pump up the liquid fertilizers 1 and 2 (liquid fertilizers A and B) are connected to the control board 31, and the liquid fertilizer pumps that pump up the liquid fertilizers 3 to 6 (liquid fertilizers C to F) are connected to the control board 31. not connected to. For this reason, only the liquid fertilizers 1 and 2 are capable of switching whether or not to perform a liquid fertilizer filling operation, and the liquid fertilizers 3 to 6 are not capable of switching whether or not to perform a filling operation. Further, while one liquid fertilizer filling operation is being performed, it is impossible to perform another liquid fertilizer filling operation. Therefore, as shown in FIG. 5, while the filling operation of the liquid fertilizer 1 is being performed, it is not possible to switch whether or not to perform the filling operation of the liquid fertilizer 2 (the slide switch is displayed as a broken line or in a faint state).

Then, the mobile terminal 60 transmits the status of each slide switch set to the above-mentioned “liquid fertilizers 1 to 6” to the cloud 90. That is, the mobile terminal 60 controls whether or not to perform a filling operation of filling the liquid fertilizers 1 and 2 into the pipes 21 and 23 and the pipes 22 and 24 from the tanks 25 and 26 to the main flow path 11, respectively, and removing air. It is configured to be configurable by the operator. The mobile terminal 60 transmits execution or non-execution of the set filling operation to the cloud 90.

The control board 31 receives the status of each slide switch set to “liquid fertilizer 1 to 6” from the cloud 90 via the communication device 32. That is, the control board 31 receives the status of each slide switch set to “liquid fertilizer 1 to 6” from the mobile terminal 60 via the cloud 90 and the communication device 32.

When the control board 31 receives the execution of the liquid fertilizer filling operation, it opens the solenoid valve 34 and drives the motor of the liquid fertilizer pump corresponding to the liquid fertilizer to be filled at a predetermined rotation speed. That is, the control board 31 receives the execution or non-execution of the filling operation from the cloud 90, and when receiving the execution of the filling operation, controls the pumps 13 and 14 to execute the filling operation. The predetermined rotational speed is, for example, the lowest rotational speed at which air can be removed from the pipes 21 and 23. Thereby, it is possible to suppress the liquid fertilizer A from being wasted in the filling operation of the liquid fertilizer A. Furthermore, in the filling operation of liquid fertilizer A, the water and liquid fertilizer A flowing through the main channel 11 are not supplied to the supply ports 29A to 29C, but are discharged from the sampling port 28.

FIG. 6 is a diagram showing the main screen of the liquid fertilizer application when an abnormality occurs. Here, "alert" indicates that the state of the electromagnetic valve 34 (valve) is abnormal. When the operator confirms the above contents of the "alert" on the mobile terminal 60, the operator inspects the state of the solenoid valve 34 (liquid fertilizer supply system 10) in the field.

The present embodiment described in detail above has the following advantages.

- The control board 31 pumps up the liquid fertilizer A of the liquid fertilizer from the tank 25 of the plurality of tanks and discharges it to the main channel 11, and then pumps up the liquid fertilizer B, which is different from the liquid fertilizer A, from the tank 26 different from the tank 25. The liquid fertilizer pumps 13 and 14 are controlled to perform a cleaning operation in which only water flows into the main flow path 11 and piping 27 between pumping up and discharging into the main flow path 11. Therefore, when liquid fertilizer A is poured into the main flow path 11, a cleaning operation is performed to wash away the liquid fertilizer A in the main flow path 11 before liquid fertilizer B, which is different from the liquid fertilizer A, is flowed into the main flow path 11. Can be done. Therefore, it is possible to suppress mixing of liquid fertilizer A and liquid fertilizer B in the main channel 11, and it is possible to suppress changes in the components of liquid fertilizer A and liquid fertilizer B and precipitation of solid components. .

・During the cleaning operation, by closing the main flow path 11 using the manual valves 17A to 17C and opening the pipe 27 using the manual valve 18, the water used for the cleaning operation is not supplied to the field but is supplied from the sampling port 28. Can be discharged outside the field. Therefore, it is possible to prevent the water used in the cleaning operation from being unintentionally supplied to the field.

- If the liquid fertilizer supply system 10 is not used for a long period of time after the liquid fertilizer A is pumped up from the tank 25 and discharged into the main channel 11, the water content of the liquid mixture in the main channel 11 will evaporate and the components of the liquid fertilizer A will be There is a risk of precipitation. In this case, even if the cleaning operation is performed just before (before) liquid fertilizer B is pumped up from the tank 26 and discharged into the main flow path 11, there is a possibility that the precipitated components of liquid fertilizer A cannot be washed away with water. In this regard, the control board 31 controls the liquid fertilizer pumps 13 and 14 to perform the cleaning operation immediately after pumping up the liquid fertilizer A from the tank 25 and discharging it into the main flow path 11. According to such a configuration, the liquid fertilizer A in the main channel 11 can be quickly washed away with water before the components of the liquid fertilizer A precipitate.

- The mobile terminal 60 is configured to allow the operator to set the volume of water in the mixed solution of water and liquid fertilizers A and B (liquid fertilizers 1 and 2) and the volume of liquid fertilizers A and B, and the volume of the set water The volume and the volumes of liquid fertilizers A and B are transmitted to the cloud 90. Then, the control board 31 receives the volume of water and the volumes of liquid fertilizers A and B from the cloud 90. Therefore, the operator can set the volume of water in the mixed solution and the volumes of liquid fertilizers A and B using the mobile terminal 60 at hand, without having to go to the field where the main channel 11 and liquid fertilizer pumps 13 and 14 are installed. It is. Therefore, when setting (changing) the mixing ratio of water and liquid fertilizers A and B, it is possible to save the worker the trouble of going to the field or the like.

- The control board 31 determines the ratio between the volume of the received water and the volume of the liquid fertilizers A and B, based on the flow rate of water detected by the flow rate sensor 51, the volume of the received water, and the volumes of the liquid fertilizers A and B. The liquid fertilizer pumps 13 and 14 are controlled so that the mixed liquid mixed in is supplied from the supply ports 29A to 29C. Therefore, even if each agricultural instructor or liquid fertilizer manufacturer has a different way of thinking about the mixing ratio, the operator can simply set the volume of water and the volume of liquid fertilizers A and B in the desired mixed solution. , B at a desired mixing ratio can be supplied from the supply ports 29A to 29C. Therefore, there is no need for the operator to modify and set the mixing ratio according to differences in the concept of mixing ratio, and the operator can adjust the mixing ratio of water and liquid fertilizers A and B in the mixed solution supplied to the field etc. to the desired setting. The mixing ratio can be easily set.

- The control board 31 uses the flow rate sensor 51 when controlling the liquid fertilizer pump 13 so that the mixed liquid mixed in the ratio of the volume of the received water to the volume of the liquid fertilizer A is supplied from the supply ports 29A to 29C. The liquid fertilizer pump 13 is controlled so that the flow rate of liquid fertilizer A is proportional to the detected flow rate of water. Therefore, even if the flow rate of water changes during the supply of the mixed liquid, by making the flow rate of liquid fertilizer A proportional to the flow rate of water detected by the flow rate sensor 51, the volume of the received water and the volume of liquid fertilizer A can be adjusted. The mixed liquid mixed at the ratio of can be supplied from the supply ports 29A to 29C.

- The mobile terminal 60 allows the operator to set the water flow time (water flow period) for flowing water into the main channel 11 and the water flow rate for flowing water when supplying the mixed liquid from the supply ports 29A to 29C. The set water flow time and water flow amount are transmitted to the cloud 90. The control board 31 then receives the water flow time and water flow amount from the cloud 90. Therefore, the operator can supply the mixed liquid from the supply ports 29A to 29C using the mobile terminal 60 at hand, without having to go to the field where the main channel 11 liquid fertilizer pumps 13, 14 and the control unit 30 are installed. At this time, it is possible to set the water flow time and water flow rate for flowing water into the main flow path 11. Therefore, when setting (changing) the time (period) and amount of supplying the mixed liquid from the supply ports 29A to 29C, it is possible to save the operator the trouble of going to the field or the like.

- When supplying the mixed liquid from the supply ports 29A to 29C, the control board 31 supplies the mixed liquid from the supply ports 29A to 29C when the time during which water is passed through the main channel 11 reaches the water flow time, and when the mixed liquid is supplied from the supply ports 29A to 29C. The flow of water in the main flow path 11 is stopped and the liquid fertilizer pumps 13 and 14 are stopped at the earlier point in time when the total volume of water that has flowed reaches the received amount of water flow. Therefore, even if one of the detection of the water flow rate by the flow rate sensor 51 and the setting of the water flow time is inappropriate, the flow of water in the main flow path 11 is stopped preferentially based on the other appropriate one, and The liquid fertilizer pumps 13 and 14 can be stopped.

- The mobile terminal 60 allows the operator to execute or not execute the filling operation of filling the liquid fertilizers A and B into the pipes 21, 23 and the pipes 22, 24 from the tanks 25, 26 to the main flow path 11, respectively, and removing air. Configurable. The mobile terminal 60 transmits execution or non-execution of the set filling operation to the cloud 90, and the control board 31 receives execution or non-execution of the filling operation from the cloud 90, and when receiving the execution of the filling operation, , controls the liquid fertilizer pumps 13 and 14 to perform the filling operation. Therefore, by setting the execution of the filling operation by the operator, the pipes 21, 23 and the pipes 22, 24 from the tanks 25, 26 to the main flow path 11 are filled with liquid fertilizer A, B, respectively, and air is removed. Can be done. Therefore, the mixing ratio of water and liquid fertilizers A and B can be accurately adjusted to a desired mixing ratio.

- A pipe 27 branches off from between the manual valves 17A to 17C and the position where the liquid fertilizers A and B discharged by the liquid fertilizer pumps 13 and 14 flow in the main flow path 11. The main channels 11A to 11C are provided with manual valves 17A to 17C that open and close the main channels 11A to 11C, respectively, and the pipe 27 is provided with a manual valve 18 that opens and closes the pipe 27. Therefore, when filling the liquid fertilizers A and B, by closing the main channels 11A to 11C using the manual valves 17A to 17C and opening the pipe 27 using the manual valve 18, the liquid fertilizers A and B whose mixing ratio is not adjusted can be filled. It is possible to avoid being supplied to the field.

Note that the above embodiment can be modified and implemented as follows. The same parts as those in the above embodiment are given the same reference numerals and the description thereof will be omitted.

- When the mobile terminal 60 supplies the mixed liquid from the supply ports 29A to 29C, the operator can set only one of the water flow time (water flow period) during which water flows through the main channel 11 and the water flow rate during which water flows. may be configured to be configurable.

・The discharge amount of the liquid fertilizers 1 and 2 may be detected, and the rotational speed of the motor of the liquid fertilizer pumps 13 and 14 may be feedback-controlled so that the detected discharge amounts become the discharge amounts S1 and S2 [L/min], respectively. can.

- At the start of supply of the mixed liquid, acquire the water flow rate Fw [L/min] detected by the flow rate sensor 51, and then assume that the water flow rate Fw is constant and set the discharge amount S1 of the liquid fertilizers 1 and 2. , S2 [L/min] can also be calculated. According to such a configuration, although the accuracy of the mixing ratio of water and liquid fertilizers A and B decreases, the calculation load on the control board 31 can be reduced.

- Immediately before supplying the mixed liquid (before supply), it is also possible to supply water to the main channel 11, that is, to clean the main channel 11. In short, liquid fertilizer A (first liquid fertilizer) is pumped up from tank 25 (first tank) of tanks 25 and 26 (a plurality of tanks) and discharged to mixing section 11a (first flow path), and then Only water is supplied to the main flow path 11 and the piping 27 (second flow path) until liquid fertilizer B (second liquid fertilizer different from the first liquid fertilizer) is pumped up from a different tank 26 (second tank) and discharged to the mixing section 11a. All you have to do is perform a cleaning operation that flushes out the water.

- The control board 31 (control unit) and the cloud 90 (server) may be wirelessly connected via an access point (relay point). Furthermore, the mobile terminal 60 (terminal) and the cloud 90 may be wirelessly connected via an access point. Alternatively, the control unit 30 may be configured to allow the operator to set the volume of water in the mixed liquid and the volume of liquid fertilizer without using the mobile terminal 60 and the cloud 90. Furthermore, the control unit 30 may be configured such that the operator can set execution or non-execution of the cleaning operation and execution or non-execution of the filling operation.

- The manual valves 15, 17A to 17C, and 18 can be configured with electromagnetic valves, and these electromagnetic valves can be controlled by the control board 31. According to this configuration, the operator can set execution of the filling operation using the mobile terminal 60 at hand without going to the field where the main channel 11, liquid fertilizer pumps 13, 14, and control unit 30 are installed. be. Therefore, if there is no need for the operator to replenish the liquid fertilizers A and B, the operator can save time and effort in going to the field or the like when performing the filling operation. Note that the replenishment of liquid fertilizers A and B can also be configured to be controlled by the control board 31. In this case, the operator can replenish the liquid fertilizers A and B, and also perform the filling operation of the liquid fertilizers A and B, without having to go to the field where the main channel 11, the liquid fertilizer pumps 13 and 14, and the control unit 30 are installed. can do. Furthermore, in the liquid fertilizer supply system 10, the function of filling the liquid fertilizers A and B can be omitted.

- When the manual valves 15, 17A to 17C, and 18 are configured with electromagnetic valves (hereinafter referred to as "electromagnetic valves 17A to 17C" and "electromagnetic valve 18"), and these electromagnetic valves are controlled by the control board 31, the following It is also possible to perform a cleaning operation (cleaning operation) as shown in FIG. That is, the control board 31 pumps up liquid fertilizer A from the tank 25 and discharges it to the main flow path 11A while opening the main flow path 11A using the electromagnetic valve 17A (first valve) and closing the piping 27 using the electromagnetic valve 18. Then, with the main flow path 11B opened by the solenoid valve 17B and the piping 27 closed by the solenoid valve 18, the solenoid valves 17A to The liquid fertilizer pumps 13 and 14 are controlled to perform the cleaning operation with the main channels 11A to 11C closed by the solenoid valve 17C and the pipe 27 opened by the solenoid valve 18. According to this configuration, the control board 31 collectively controls the supply of liquid fertilizer A to the field, the cleaning operation of the main flow path 11, and the supply of liquid fertilizer B to the field through control of the solenoid valves 17A to 17C and the solenoid valve 18. can be controlled.

- In the above embodiment, a single supply operation of the mixed liquid has been described, but it is also possible to program a plurality of supply operations of the mixed liquid to be executed in one day in the mobile terminal 60. In that case as well, the volume of water and the volume of liquid fertilizer can be set for each supply operation of the mixed liquid. Further, in the mobile terminal 60, a mixed liquid supply operation can be programmed to be executed with changing conditions every week or every month. In that case as well, the volume of water and the volume of liquid fertilizer can be set for each time when the mixed liquid is supplied.

- A plurality of sets of the main flow path 11, liquid fertilizer pumps 13, 14, and control unit 30 are installed, and the volume of water and the volume of liquid fertilizer can be set for the plurality of sets using one mobile terminal 60.

10... Liquid fertilizer supply system, 11... Main channel (first channel), 11A... Main channel (first channel), 11B... Main channel (first channel), 11C... Main channel (first channel), 13...Liquid fertilizer pump (pump), 14...Liquid fertilizer pump (pump), 17A...manual valve (first valve), 17B...manual valve (first valve), 17C...manual valve (first valve), 18...manual valve (second valve), 20... water source, 25... tank (first tank, second tank), 26... tank (second tank, first tank), 27... piping (second flow path), 28... sampling port (Exhaust port), 29... Supply port, 30... Control unit, 31... Control board (control unit), 34... Solenoid valve, 51... Flow rate sensor, 60... Mobile terminal (terminal), 90... Cloud (server).

Claims (7)

a first flow path connected to a supply port for supplying water and liquid fertilizer to the field;
a first valve that opens and closes the first flow path;
a pump that pumps up liquid fertilizer from each of the plurality of tanks and discharges it to the first flow path;
a control unit that controls the pump;
A second branch branching from between the first valve and a position where the liquid fertilizer discharged by the pump flows in the first flow path, and connected to a discharge port that discharges the water and the liquid fertilizer to a place other than the field. A flow path and
a second valve that opens and closes the second flow path;
a flow rate sensor that detects the flow rate of the water flowing through the first flow path;
Equipped with a server and a wirelessly connected terminal,
The control unit pumps up a first liquid fertilizer of the liquid fertilizer from a first tank of the plurality of tanks and discharges it into the first flow path, and then pumps up the liquid fertilizer from a second tank different from the first tank. Between the time when a second liquid fertilizer different from the first liquid fertilizer is pumped up and discharged into the first flow path, a cleaning operation is performed to flow only the water into the first flow path and the second flow path. controlling said pump to;
The control unit is wirelessly connected to the server,
The terminal is configured to allow an operator to set the volume of the water in the mixed liquid and the volume of the liquid fertilizer, and transmits the set volume of the water and the volume of the liquid fertilizer to the server,
The control unit receives the volume of the water and the volume of the liquid fertilizer from the server, and based on the flow rate of the water detected by the flow rate sensor and the received volume of the water and the volume of the liquid fertilizer, A liquid fertilizer supply system that controls the pump so that a mixed liquid mixed in a ratio of a volume of the received water to a volume of the liquid fertilizer is supplied to the supply port . When controlling the pump so that a mixed liquid mixed in a ratio between the volume of the received water and the volume of the liquid fertilizer is supplied from the supply port, the control unit controls the flow rate sensor to The liquid fertilizer supply system according to claim 1 , wherein the pump is controlled so that the flow rate of the liquid fertilizer is proportional to the flow rate of the water. The terminal is configured such that an operator can set a water flow period during which the water is passed through the first flow path and a water flow rate during which the water is flowed when the mixed liquid is supplied from the supply port. , transmitting the set water flow period and the water flow amount to the server,
The control unit receives the water flow period and the water flow amount from the server, and determines that the period during which the water is distributed through the first channel when the mixed liquid is supplied from the supply port is the water flow period. and the time when the total volume of the water flowing when the mixed liquid is supplied from the supply port reaches the received water flow rate, whichever is earlier. 3. The liquid fertilizer supply system according to claim 2 , wherein the liquid fertilizer supply system stops water flow in and stops the pump. The terminal is configured to allow an operator to set execution or non-execution of a filling operation of filling the pipe from the tank to the first flow path with the liquid fertilizer and removing air, and Sending execution or non-execution of an action to the server;
Claims 1 to 3, wherein the control unit receives execution or non-execution of the filling operation from the server, and controls the pump to execute the filling operation when receiving the execution of the filling operation. The liquid fertilizer supply system according to any one of the above. The first valve and the second valve are electromagnetic valves that are opened and closed under the control of the control unit,
The control unit is configured to pump up the first liquid fertilizer from the first tank and to pump the first liquid fertilizer into the first tank while causing the first valve to open the first flow path and causing the second valve to close the second flow path. After discharging into the first flow path, the second liquid fertilizer is discharged from the second tank while the first flow path is opened by the first valve and the second flow path is closed by the second valve. Between pumping up and discharging into the first flow path, the cleaning operation is performed with the first valve closing the first flow path and the second valve opening the second flow path. A liquid fertilizer supply system according to any one of claims 1 to 4 , wherein the liquid fertilizer supply system controls the pump to perform. a first flow path connected to a supply port for supplying water and liquid fertilizer to the field;
a first valve that opens and closes the first flow path;
a pump that pumps up liquid fertilizer from each of the plurality of tanks and discharges it to the first flow path;
a control unit that controls the pump;
A second branch branching from between the first valve and a position where the liquid fertilizer discharged by the pump flows in the first flow path, and connected to a discharge port that discharges the water and the liquid fertilizer to a place other than the field. A flow path and
a second valve that opens and closes the second flow path;
A terminal wirelessly connected to the server,
Equipped with
The control unit pumps up a first liquid fertilizer of the liquid fertilizer from a first tank of the plurality of tanks and discharges it into the first flow path, and then pumps up the liquid fertilizer from a second tank different from the first tank. Among them, a cleaning operation is performed in which only the water is flowed into the first flow path and the second flow path between pumping up a second liquid fertilizer different from the first liquid fertilizer and discharging it into the first flow path. controlling said pump to;
The first valve and the second valve are electromagnetic valves that are opened and closed under the control of the control unit,
The control unit is configured to pump up the first liquid fertilizer from the first tank and to pump the first liquid fertilizer into the first tank while causing the first valve to open the first flow path and causing the second valve to close the second flow path. After discharging into the first flow path, the second liquid fertilizer is discharged from the second tank while the first flow path is opened by the first valve and the second flow path is closed by the second valve. Between pumping up and discharging into the first flow path, the cleaning operation is performed with the first valve closing the first flow path and the second valve opening the second flow path. controlling said pump to perform;
The control unit is wirelessly connected to the server,
The terminal is configured to allow an operator to set execution or non-execution of a filling operation of filling the pipe from the tank to the first flow path with the liquid fertilizer and removing air, and Sending execution or non-execution of an action to the server;
The control unit receives execution or non-execution of the filling operation from the server, and when receiving the execution of the filling operation, causes the first valve to close the first flow path and causes the second valve to close the first flow path. A liquid fertilizer supply system that controls the pump to perform the filling operation with the second channel open. Any one of claims 1 to 6 , wherein the control unit controls the pump to perform the cleaning operation immediately after pumping up the first liquid fertilizer from the first tank and discharging it into the first flow path. The liquid fertilizer supply system according to item 1 .

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